*{border: 0;padding: 0;margin: 0;list-style: none;}
.a1{
    width: 100%;
    height: 730px;
    background: black;
    position: relative;
}
video{
    position: absolute;
    width: 100%;
    margin-top: 80px;
}
.b2{
    width: 1000px;
    height: 40px;
    position:absolute ;
    text-align: center;
    line-height: 50px;
    left: 50%;
    top: 65%;
    transform:translate(-50%,-50%);
}
.b2 p{   
    font-size: 28px;
    color: white;
}
.b2 img{
    width: 700px;
    height: auto;
    margin-bottom: 50px;
}
.b3{
    width: 800px;
    height: 200px;
    position:absolute ;
    left: 50%;
    transform:translate(-50%,-20%)
}
.b3 img{
    margin-top: 50px;
    margin-left: 50px;
    width: 200px;
    height: auto;
    float: left; 
    transition: all 0.5s;  
}
.b3 img:hover{   
    transform: translate(0,-10%);
}  
.c2{
    width: 1260px;
    height: 80px;
    position:absolute ;
    background: black;
    text-align: center;
    left: 50%;
    transform:translate(-50%,0)  
}
.c2 ul li{
    float: left;
}
.c2 .left img{
    width: 160px;
}
.c2 .center a{
    width: 100px;
    float: left;
    text-decoration: none;
    margin-top: 20px;
}
.c2 .center span:nth-child(1)
{
    font-size: 1.2em;
    color: white;
}
.c2 .center span:nth-child(2)
{
    font-size: 0.7em;
    color: grey;
}
.c2 .center a{
    margin-left: 30px;
}
.c2 .right a {
    text-decoration: none;
    margin-left: 10px;
    text-align: center;
    display: inline-block;
}
.c2 .right a:nth-child(1){
    margin-left: 70px;
}
.c2 .right a:nth-child(2){
    margin-left: 20px;
}
.c2 .right a img:nth-child(1){
    width: auto;
    height: 35px;
}
.c2 .right a img:nth-child(2){
    width: auto;
    height: 35px;
}
.c2 .right img:nth-child(3){
    width: auto;
    height: 55px;
    margin-left: 40px;
    margin-top: 10px;
}
.nav{
    width: 100%;
    height: 340px;
    background: rgba(0, 0, 0, 0.5);
    display: none;
}
.center:hover .nav{
    display: block;
}
.nav ul{
    width: 80px;
    margin-left: 50px;
    color: white;
    font-size: 14px;
    float: left;  
}
.nav ul:nth-child(1){
    margin-left: 30px;
}
.nav ul li{
    width: 100px;
    height: 30px;
    line-height: 30px;
    text-align: center;
    cursor: pointer;
}
.nav ul li:hover{
    color: #fddb00;
}
.nav2{
    margin-left: 60px;
    width: 350px;
    height: 180px;
    background: rgba(0, 0, 0, 0.5);
    display: none;
}
.right:hover .nav2{
    display: block;
}
.nav2 img{
    width: 150px;
}
.nav2 ul li{
    margin-top: 15px;
    margin-left: 10px;
}
.nav2 p{
    font-size: 16px;
    color: #f5eded;
    line-height: 27px;
    margin-left: 20px;
}
.footer{
    width: 100%;
    height: 150px;
    background: #000;
    text-align: center;
    line-height: 20px;
    margin-top: 0px;
    position: absolute;
}
.footer a{
    margin-top: 20px;
    font-size: 12px;
    text-decoration: none;
    color: gray;
    display: inline-block;
}
.direction{
    position: absolute;
    top: 0;
}